Blow-off cock.



Patented 1an. 23, |900.

W. MGINTUSH.

BLOW-OFF COCK.

(No Modal.)

PATENT .Tric

VILLIAM MCINTOSH,`OF VINONA, MINNESOTA.

BLOW-OFF COCK.

SPECIFICATION 'forming part of Letters Patent No. 641,790, dated January 23, 1900.

Application Jfiled August 12, 1895. Serial No. 558,951.` (No model.)

To all whom it may concern/.-

Be it known that LWILLIAM MoINTosH, residing at Winona, in the county of Winona and State of Minnesota, have invented a new and useful Improvement in Blow-OE Cocks, of which the following is a specification.

The object of my invention is to provide a simple and efficient blow-0E device for use in connection with boilers of all kinds and which shall be capable of opera tion by iiuid-pressu re mechanism.

In the accompanying drawings, Figure l is a central sectional View of my device, showing the blow-oft port or discharge-opening closed by the valve. Fig. 2 is a similar view showing the position of parts when the port is open and Fig. 3, a view of a portion of a locomotiveboiler, showing the arrangement diagrammatically of the fiuid-pressure-supply pipe and the engineers valve.

In the proper discharge-opening or blow-off port in the sheet A of the boiler I prefer to secure a portion A,which I term a foundation` A valve-casing B is adapted to screw into this plug and is provided with an inletpassage communicating with the interior of the boiler and governed by avalve C and with an outlet-passage or exhaust C. This valve is provided with a stem c, which extends into a fluid-pressure chamber or cylinder D,where the end of the stem is provided with a pistonhead E, traveling in such cylinder. The top of the cylinder comm unicates,by means of the inlet pipe or passage d, with any suitable source of fluid-pressure for the proper operation of the piston-head and valve. The device may therefore be termedacounterpressure blow-oft cock. The blow-01T cock may obviously be placed in*v any suitable position on the boiler, and in Fig. 3 I have, for the purpose of illustration, shown it as communicating with the front water-leg. The su pply-pipe d communicates with a pipe d,which supplies Huid-pressure, air, or steam, and such communication is under the control of a suitable valve d2, operated by the engineer. Fig. 3 shows in diagram these pipes and valve. In

the cylinder and below this piston-head I arrange a suitable spring F, whose tension serves to keep the valve and other parts in their'normal position, as illustrated in Fig. 1 of the drawings. A suitable bleed or exhaust opening f is provided in the side of the cylinder to allow the air below the piston-head to escape.

The device, being constructed as above set forth, operates as follows: From his position in the cab or elsewhere, by operating valve (Z2, Huid-pressure is admitted by the engineer or operator through pipe d to the head of the piston,which is caused to travel in the cylinder, and thereby force the valve G from its seat against the boiler-pressure and the tension of the spring F. The parts when in this position of blowing oft are clearly illustrated in Fig. 2, wh erein it is seen that a direct passage is provided for the steam, water, and impurities to escape from the boiler past the valve and out through the outlet or exhaust passage C.

dant supply of Huid-pressure, and the drawings show the construction of such a device as used for that particular purpose, although I do not intend to restrict myself thereto, as I contemplate using my invention wherever applicable.

My device may be operated by air-pressure from Vthe usual air-drum or by steam-pressure which is independent of that pressure adjacent to the blow-off port of the boiler. In both cases therefore the pressure which operates the duid-pressure mechanism is derived from an independent source, and I employ the word independent in the claims with this meaning.

' Although I have described more or less eX- act forms and details of construction,- I do not wish to be understood as limiting myself thereto, except as may be particularly pointed out in some ofthe claims,as I contemplate changes in form, proportion of parts, and substitution of equivalents as circumstances may suggest or render expedient and without departing from the spirit of my invention.

I claim-s 1. In combination with a boiler, a blow-off cock consisting of a valve-casing having a -single blow-oit port and having a dischargepassage to the atmosphere, a single valve normally closing such passage and alone governing the direct discharge from the boiler through said single port, a stem for the valve, a cylinder, a piston-head secured to this stern and operating in the cylinder, a source of fluid-pressure, and a connection between the cylinder and said source of Huid-pressure un'- 'der control of the engineer or operator, such connection being independent of the valve or its stem.

2. In combination with a boiler, a blow-olf cock consisting of a valve-casing having a discharge-passage leading from the boiler to the atmosphere and a cylinder, a single valve controlling the discharge-passage, a stem upon the valve extending into the cylinder, a piston-head secured upon the valve-stem and adapted to travel in the cylinder whereby the Valve is directly responsive to the movements ot' the piston-head and a connection under the control of the engineer or operator With a source of fluid-pressure for actuating the piston-head, such connection being extraneous of the valve and its stem and independent thereof.

3. The combination withaboiler, of avalvecasing having a discharge-passage through the boiler-shell and leading from the boiler to the atmosphere, a single valve controlling the passage and located in the plane ot' said shell and adapted to be forced into the boiler, a stem for the valve, a cylinder, a piston-head secured directly upon the valve-stein and adapted to travel in the cylinder when fluidpressure under control of the engineer is admitted thereto and a connection between the cylinder and a source of fluid-pressure indopendent of that particular pressure against the valve.

4r. The combination withaboiler, ofavalvecasing having a single discharge passage and port communicating with the boiler and atn1 osphere and also provided with an adjacent cylinder D, a stem c reciprocating in the discharge-passage and also in the cylinder, a single Valve C mounted upon one end of the siem and adapted alone to govern the discharge-passage, a piston-head E secured to the other end of the stem and traveling in the cylinder, a spring F to normally hold the piston-head to its outward limit of movement and a connection d with a suitable source of fluid-pressure under the control of the engineer or operator and leading into the cylinder.

lVILLlAM MCIN"OSH. Witnesses:

B. A. MAN, ROBERT C. HILL. 

